Bifunctional Atomically Dispersed Mo-N2/C Nanosheets Boost Lithium Sulfide Deposition/Decomposition for Stable Lithium-Sulfur Batteries

被引：120

作者：

Ma, Feng ^{[1
]}

Wan, Yangyang ^{[2
]}

Wang, Xiaoming ^{[3
,4
]}

Wang, Xinchao ^{[5
]}

Liang, Jiashun ^{[1
]}

Miao, Zhengpei ^{[1
]}

Wang, Tanyuan ^{[1
]}

Ma, Cheng ^{[5
]}

Lu, Gang ^{[2
]}

Han, Jiantao ^{[1
]}

Huang, Yunhui ^{[1
]}

Li, Qing ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

[2] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA

[3] Shantou Univ, Dept Chem, Shantou 515063, Peoples R China

[4] Shantou Univ, Key Lab Preparat & Applicat Ordered Struct Mat Gu, Shantou 515063, Peoples R China

[5] Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Dept Mat Sci & Engn, Div Nanomat & Chem,Hefei Natl Lab Phys Sci Micros, Hefei 230026, Anhui, Peoples R China

来源：

ACS NANO | 2020年 / 14卷 / 08期

基金：

美国国家科学基金会;

关键词：

Li-S battery; lithium polysulfide conversion; atomically dispersed catalyst; energy storage; electrocatalysis; HYDROGEN EVOLUTION; PERFORMANCE; METAL; CATALYST; HETEROSTRUCTURES; POLYSULFIDES; SPECTROSCOPY; POLYANILINE; CONVERSION; MECHANISM;

D O I：

10.1021/acsnano.0c03325

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The sluggish kinetics of lithium polysulfides (UPS) transformation is recognized as the main obstacle against the practical applications of the lithium-sulfur (Li-S) battery. Inspired by molybdoenzymes in biological catalysis with stable Mo-S bonds, porous Mo-N-C nanosheets with atomically dispersed Mo-N-2/C sites are developed as a S cathode to boost the LiPS adsorption and conversion for Li-S batteries. Thanks to its high intrinsic activity and the Mo-N-2/C coordination structure, the rate capability and cycling stability of S/Mo-N-C are greatly improved compared with S/N-C due to the accelerated kinetics and suppressed shuttle effect. The S/Mo-N-C delivers a high reversible capacity of 743.9 mAh g(-1) at 5 C rate and an extremely low capacity decay rate of 0.018% per cycle after 550 cycles at 2 C rate, outperforming most of the reported cathode materials. Density functional theory calculations suggest that the Mo-N-2/C sites can bifunctionally lower the activation energy for Li2S4 to Li2S conversion and the decomposition barrier of Li2S, accounting for its inherently high activity toward LiPS transformation.

引用

页码：10115 / 10126

页数：12

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